TY - JOUR

T1 - Observation of the electromagnetic Dalitz transition hc →e+e-ηc

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2020YFA0406300, No. 2020YFA0406400, No. 2023YFA1606000; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11635010, 11735014, 11935015, 11935016, 11935018, 12025502, 12035009, 12035013, 12061131003, 12075250, 12075252, 12192260, 12192261, 12192262, 12192263, 12192264, 12192265, 12221005, 12225509, 12235017, 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); Joint LargeScale Scientific Facility Funds of the NSFC and CAS under Contract No. U1832207; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Contract Nos. FOR5327, GRK 2149; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contract Nos. 2021.0174, 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF2022R1A2C1092335; National Science and Technology fund of Mongolia; National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources & Institutional Development, Research and Innovation of Thailand under Contracts No. B16F640076, No. B50G670107; Polish National Science Centre under Contract No. 2019/35/O/ST2/02907; Swedish Research Council under Contract No. 2019.04595; The Swedish Foundation for International Cooperation in Research and Higher Education under Contract No. CH2018-7756.

PY - 2024/12/12

Y1 - 2024/12/12

N2 - By analyzing (27.12±0.14)×108 ψ(3686) events collected with the BESIII detector operating at the BEPCII collider, the decays χcJ→pp¯KS0K-π++c.c. (J=0,1,2) are observed for the first time with statistical significances greater than 10σ. The branching fractions of these decays are determined to be B(χc0→pp¯KS0K-π++c.c.)=(2.61±0.27±0.32)×10-5, B(χc1→pp¯KS0K-π++c.c.)=(4.16±0.24±0.46)×10-5, and B(χc2→pp¯KS0K-π++c.c.)=(5.63±0.28±0.46)×10-5, respectively. The processes χc1,2→p¯Λ(1520)KS0π++c.c. are also observed, with statistical significances of 5.7σ and 7.0σ, respectively. Evidence for χc0→p¯Λ(1520)KS0π++c.c. is found with statistical significances of 3.3σ. The corresponding branching fractions are determined to be B(χc0→p¯Λ(1520)KS0π++c.c.)=(1.61-0.64+0.68±0.23)×10-5, B(χc1→p¯Λ(1520)KS0π++c.c.)=(4.06-0.76+0.80±0.52)×10-5, and B(χc2→p¯Λ(1520)KS0π++c.c.)=(4.09-0.84+0.87±0.42)×10-5. Here, the first uncertainties are statistical and the second ones are systematic.

AB - By analyzing (27.12±0.14)×108 ψ(3686) events collected with the BESIII detector operating at the BEPCII collider, the decays χcJ→pp¯KS0K-π++c.c. (J=0,1,2) are observed for the first time with statistical significances greater than 10σ. The branching fractions of these decays are determined to be B(χc0→pp¯KS0K-π++c.c.)=(2.61±0.27±0.32)×10-5, B(χc1→pp¯KS0K-π++c.c.)=(4.16±0.24±0.46)×10-5, and B(χc2→pp¯KS0K-π++c.c.)=(5.63±0.28±0.46)×10-5, respectively. The processes χc1,2→p¯Λ(1520)KS0π++c.c. are also observed, with statistical significances of 5.7σ and 7.0σ, respectively. Evidence for χc0→p¯Λ(1520)KS0π++c.c. is found with statistical significances of 3.3σ. The corresponding branching fractions are determined to be B(χc0→p¯Λ(1520)KS0π++c.c.)=(1.61-0.64+0.68±0.23)×10-5, B(χc1→p¯Λ(1520)KS0π++c.c.)=(4.06-0.76+0.80±0.52)×10-5, and B(χc2→p¯Λ(1520)KS0π++c.c.)=(4.09-0.84+0.87±0.42)×10-5. Here, the first uncertainties are statistical and the second ones are systematic.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85212677488&origin=inward&txGid=f38b80f5cae0cc7db5fca5ce78f553e7

UR - https://elibrary.ru/item.asp?id=82035181

UR - https://www.mendeley.com/catalogue/260461c5-bce8-3200-9176-4958bb25c7fa/

U2 - 10.1103/PhysRevD.110.L111101

DO - 10.1103/PhysRevD.110.L111101

M3 - Article

VL - 110

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 11

M1 - 112009

ER -